Electromagnet.



E. J. GUAY. BLEG'IIROMAGNBT. APPLICATION FTLED APR. 11, 1907.

l/atfented Mar. 31, 19111 Fig. 2.

lnvetor. Emile J. Gua b g W Witnesses'.

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UNITED sTATEs PATENT oEEicE. EMILE J. GUAY, 0F LYNN MASSACHUSETTS', ASSIGNOR TO GENAERAL ELECTRIC COMPA] Y, A CORPORATION 0F NEW YORK.

ELECTROMAGNET.

Specification of Letters Patent. I Patented Ma13i31, 1914.

Application filed April 11, 1907. Serial No. 367,672. v

To all whom it may concern Be it known that I, EMILE J. GUAY, a citizen of the United States, residing at Lynn, county of Essex, State of Massachusetts, have invented certain new and useful Improvements in Electromagnets, of which the following is a specication.

A very satisfactory form of armature for electromagnets consists of a core member and a surrounding shell member, the exciting coil being arranged in the space between the two members, thus forming lan iron-clad magnet.

My invention relates to magnets having armatures of this type, and it contemplates a novel construction and arrangement of parts and method of manufacture whereby such magnets are improved in construction; the cost of manufacture reduced; and the field of usefulness extended.

To the above end I form armatures of the character described from a single tubular piece which is first split longitudinally i throughout a portion of its length at a number of points and the arms which are thus produced are then turned outward and upward so as to form a cluster about and parallel with the undivided portion of the tube. Such an armature is not only simply and cheaply made but is adapted to conditions of service which require that the central portion of the magnet and armature remain unobstructed. l

The various features of novelty consti tuting my invention will be hereinafter particularly pointed out in the claim; but, for a full understanding of the invention and of its various objects and advantages, reference is to be had to the following detailed description taken in connection with the accompanying drawing, wherein,

Figure 1 is a side elevation of an arc lamp, the regulating magnet of which is constructed and arranged in accordance with a preferred form of my invention;

Fig. 2. is a side elevation of the armature of the electromagnet showing its method of 'manufacture; and Fig. 3 is a view partly in side elevation and partlyr in section, show-- ing the armature and its relation to the energizing coil.

Referring to the drawing, 1 indicates my improved armature as a whole. It consists of a central tubularmember or shell 2 havslitting it throughout a portion of its length, as shown at 4 in the dotted lines in Fig. 2, and thereafter bending the several members 3 outwardly Vand then upwardly, so that a longitudinal section through one of the arms and the adjacent portion of the central tube is U-shaped. The distance between the arms and the tube is made such that the exciting coil 5 may be nested withm the space between them without coming vin contact therewith.

It will be seen that an armature made in accordance with my invention is exceedingly strong and light and that, because of the simple method of manufacturing it from a single piece of metal, it can be produced at small cost.4

In Fig. 1, I have illustrated my invention as applied to an arc lamp wherein cheapness, lightness and durability are of vital importance. The lamp illustrated is of that kind which has a central chimney about which it' is desired to place the coil of the regulating magnet. The chimney is indicated at 6. The coil of the regulating magnet is supported on the chimney by suitable brackets 7 and 8. The parts are so proportioned that the internal diameter of the tubular portion of the armature is slightly greater than the vexternal diameter of the chimney, so that this part of the armature can play freely up and down be' tween the chimney and the exciting coil.

By this arrangement the central regulat ing magnet may be used without in any way choking thechimney, as would be necessary in case the'core of the magnet were located within the chimney, as is usual in lamps having their magnets concentric with the backbone. This feature is of great importance in luminous arc lamps wherein the dense vapors which are given oft' would be almost certain to condense about an interior core so as to interfere seriously with the operation of the lamp. The clutch mechanism 9 of the lamp may be connected to the armature in any suitable way, as by means of a link 10.

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What I claim as new, and desire to se- In witness whereof, l have hereunto set eure by Letters Patent of the United States,

my hand this ninth day of April, 1907.

An armature for electromagnets consist- EMILE J' GUAY' 5 ing of a Central tube having aJ cluster of Witnesses:

arms which project outwardly and then JOHN A. MCMANUS, Jr., about and parallel with the tube.

HARRY E. HEATH. 

